Solution of problem N2595 probability theory

Solution of problem N2595 probability theory

2595. For every 100 electric lamps of plant “A”, on average there are 83 standard, plant “B” - 63 standard. 70% of bulbs come from the factory “A” and 30% from the factory “B” to the store. The purchased light bulb was standard. Determine the probability that the light bulb is made at the factory "A."

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)